Great Bear Rainforest Salmon Report - Supplemental Information

Introduction

This webpage hosts summary plots for Rosenberger and Bottoms (in prep). Analyses use data from DFO’s New Salmon Escapement Database Systems (NUSEDs) up to 2022.

Escapement plots

Escapement plots over time, by species, by Conservation Unit. Colours represent whether or not the stream qualified for analysis in this study. Solid vertical lines denote the establishment of the Great Bear Rainforest Special Protection Area (GBR SPA) in 2007 and dashed vertical lines represent the cutoff for the current generation included in the analyses.

Summary Table

Species	Included in analysis	Number of streams
Chinook	Y	70
Chum	Y	198
Coho	Y	202
Pink (Even years)	Y	193
Pink (Odd years)	Y	202
Sockeye	Y	48
Chinook	N	48
Chum	N	278
Coho	N	296
Pink (Even years)	N	275
Pink (Odd years)	N	252
Sockeye	N	69

Chinook

Chum

Coho

Pink (Even years)

Pink (odd years)

Sockeye

Trends

This section compares trends in escapements by Conservation Unit on all waterbodies selected for analysis by period.

Periods are defined as:

all :

• Baseline metric, represents the trend over all years from 1920 - 2006 (one year before the establishment of the GBR SPA)

cgen :

• Trend for the current generation (2022 minus one generation length)

preGBR :

• Comparison metric representing the trend for three generations before the establishment of the GBR SPA

postGBR :

• Comparison metric representing the trend for three generations after the establishment of the GBR SPA

All species

Comparisons across all Conservation Units

Chinook

Chum

Coho

Pink (Even years)

Pink (Odd years)

Sockeye

Trend Ratios

This section shows how trends compare across periods. Comparison periods are defined as:

trnd.cgen.all:

• Ratio comparing how the escapement trend of the current generation is performing against the baseline trend over all years prior to the GBR SPA.

trnd.cgen.pre:

• Ratio comparing how the escapement trend of the current generation cgen is performing against the trend over three generations prior to the GBR SPA.

trnd.post.all:

• Ratio comparing how the escapement trend of the three generations following the GBR SPA is performing against the baseline trend over all years prior to the GBR SPA.

trnd.post.pre:

• Ratio comparing how the escapement trend of the three generations following the GBR SPA is performing against the three generations prior to the GBR SPA.

All species

Comparisons across all Conservation Units

Chinook

Chum

Coho

Pink (Even years)

Pink (Odd years)

Sockeye